Tokens look like three blobs of base64 glued with dots, and every developer has spent an afternoon clicking through one to see who it claims to be. The three parts are header, payload, and signature, and the tool splits them cleanly.
Decode a JWT into its header and payload JSON with expiry warnings on show. Decoding is not verifying, the signature is checked separately, so treat the human-readable claims as a starting point, not proof.
Try it now: open the free tool, runs 100{ddff9936f8333f09603555df7bd6492034f3a4a35de784276d3cf3d66166a113} in your browser.
Bottom line: decode on the client, verify on the server, read the expiry first.
Your turn: use the tool free here, no signup, nothing leaves your device.
How do you use JWT (JSON Web Token) Decoder?
Open the JWT (JSON Web Token) Decoder in your browser (Split tokens into header, payload, and signature). Type or paste your input, adjust the options, and copy the result. Everything runs locally on your device with no account and nothing stored, so the three steps below take seconds even for confidential work.
- Paste the text you want to work with.
- Choose the transformation you need.
- Copy the result, or tweak the input to see it update live.
Try JWT (JSON Web Token) Decoder free. It opens right in your browser.